 Making the a-arms "wider"...besides camber issues,, what other "gotchas" will I hit?? |
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| Mueller |
 Jul 13 2005, 08:24 PM
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914 Freak!  Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None 
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Trying to figure out if I can safely go 1" per side to make the front track the same as the rear....I currently have 1.25" thick spacers, so I could eliminate those which would be nice.
I figure not that big of a deal on the camber since that is easily fixed by opening up the top of the shock tower (salvage title car, so no worries about "ruining it" (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) ) For those that have installed turbo-tie rods, do you think there is enough adjustment to move the ends out an inch per side??? Attached image(s) 
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| J P Stein |
Mar 29 2006, 07:33 PM
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
OK, here's the way I see the problem...no pics (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
"Normal" positive scrub radius adds steering feed back to the steering wheel. Let's figure (WAG) .50 inches with a 5.5 inch wide 914 wheel. As the tire turns from straight ahead, it describes an arc of .5 radius. The center of forward motion comes from the rear wheels to the center of the ball joint......pushng the front wheels foreward. If the tire is turned 45 deg, the center of the tire is leading the ball joint by about .25 in.....easily overcome as there is little mechanical advantage. My 10 inch wide tire/wheel sets the scrub radius to around 2.25 inches futher out ....all the offset is outboard..for a total scrub radius of positive 2.75 inches. At 45 deg, that would mean the center of the tire is 1.37 inches foreward & an equal amount outboard of the balljoint.....the force is pushing into that causing the tire to skip sideways. Granted, max lock is maybe 20 deg deflection. I used 45 to simplify the calcs and the actuals would be half that. Then again, I could well be fulla shit (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif) Either way, I'm getting that radius down to about 1.25 with my "new improved" set-up.....we'll see. |
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Posts in this topic
Mueller Making the a-arms "wider"...besides camber issues, Jul 13 2005, 08:24 PM
TimT hehehe,
some of "F troop" try and make the A-arm ... Jul 13 2005, 08:37 PM bondo Here's a gotcha.. different (lower) effective ... Jul 13 2005, 08:39 PM Mueller Jul 13 2005, 08:39 PM Mueller Jul 13 2005, 08:40 PM bondo What if you widened the crossmember and moved the ... Jul 13 2005, 08:44 PM MattR wider is better http://www.914world... Jul 13 2005, 08:47 PM Mueller Jul 13 2005, 08:48 PM Howard R Mike,
You can certainly 19mm without any problems... Jul 13 2005, 09:42 PM Brett W When you lengthen the arms you need to make sure t... Jul 13 2005, 09:48 PM john rogers I use 1 inch spacers in the front and 1 1/4 spacer... Jul 13 2005, 10:32 PM Britain Smith There is a guy on the Pelican board that had this ... Jul 13 2005, 10:44 PM McMark <... Jul 14 2005, 01:08 AM ArtechnikA Jul 14 2005, 06:21 AM redshift http://www.914world.com/bbs2/ht... Mar 28 2006, 12:32 PM Mueller the second modification to the steering rack will ... Mar 28 2006, 12:35 PM turbo914v8 How wide do you want to go? = How deep is your poc... Mar 28 2006, 12:39 PM groot Wider is better, as you know. I've done it (by... Mar 28 2006, 12:43 PM groot And... when I made my camber plates I actually had... Mar 28 2006, 12:45 PM Mueller Mar 28 2006, 12:49 PM groot You have a welder, right?
They can be lengthened ... Mar 28 2006, 12:49 PM Mueller Mar 28 2006, 01:08 PM groot Do it!!!! It'll make you feel ... Mar 28 2006, 01:55 PM Mueller Mar 28 2006, 03:25 PM Mueller <... Mar 28 2006, 04:52 PM J P Stein I've stared at this till I'm blue in the f... Mar 28 2006, 06:56 PM Mueller <... Mar 28 2006, 09:01 PM Mueller Mar 28 2006, 09:03 PM Porcharu Mar 29 2006, 01:50 AM groot As I understand scrub radius, it increases the mom... Mar 29 2006, 06:30 AM Brett W Scrub radius is bad. This is one of the major pro... Mar 29 2006, 07:50 AM Bigbohr This is what a 964/993 front looks like: the strut... Mar 29 2006, 08:08 AM J P Stein Positive scrub radius doesn't seem to be a hug... Mar 29 2006, 08:19 AM J P Stein <... Mar 29 2006, 08:20 AM groot Ummmm, drugs are bad, umkay.
http... Mar 29 2006, 12:00 PM groot JP, good illustration (figuratively). I agree with... Mar 30 2006, 07:00 AM J P Stein Mar 30 2006, 08:56 AM andys Your increased scrub radius accentuates the change... Mar 30 2006, 11:12 AM Cloudbuster Mar 30 2006, 12:01 PM Mueller pics for JP.....'91 C2 (sorry for being so dir... Apr 3 2006, 12:08 PM Mueller red arrows show pivot points....mono-ball replacem... Apr 3 2006, 12:09 PM
J P Stein need a pic looking fwd or aft.....like Groot's... Apr 3 2006, 12:57 PM |
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